CN106470468B

CN106470468B - Transmission method and device for random access response

Info

Publication number: CN106470468B
Application number: CN201510502962.1A
Authority: CN
Inventors: 高雪娟; 徐伟杰; 邢艳萍
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2015-08-14
Filing date: 2015-08-14
Publication date: 2020-08-07
Anticipated expiration: 2035-08-14
Also published as: JP6618060B2; KR20180039721A; US20180249508A1; EP3337247B1; WO2017028756A1; US10779329B2; EP3337247A1; KR102171130B1; JP2018523445A; EP3337247A4; CN106470468A

Abstract

The invention discloses a transmission method and a transmission device of random access responses, which are used for ensuring that random access responses with different coverage enhancement levels are independently sent, reducing blind detection of a terminal on a physical downlink control channel and saving power consumption of the terminal. The invention provides a transmission method of random access response, which comprises the following steps: a network side determines the frequency domain resources of a physical downlink control channel at least according to the coverage enhancement level corresponding to the physical downlink control channel, wherein the frequency domain resources of the physical downlink control channel with different coverage enhancement levels are independently configured; and the network side sends the physical downlink control channel on the frequency domain resource of the physical downlink control channel.

Description

Transmission method and device for random access response

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting a random access response.

Background

Contention random access refers to a random access process completely initiated by a Terminal, where a base station (eNodeB, eNB) does not allocate a dedicated resource to the Terminal (User Terminal, also called User Equipment, UE). The contention random access is applicable to all five scenarios, and for scenarios of Radio Resource Control (RRC) connection establishment, RRC connection reestablishment, and uplink data arrival, the random access is completely autonomous by the terminal, and the eNB does not have any prior information; for handover and downlink data arrival scenarios, the terminal initiates random access according to the instruction of the eNB, generally speaking, the eNB will preferentially select non-contention random access, and only when the non-contention random access resources are not allocated enough, the terminal will be instructed to initiate contention random access. The contention random access procedure is completed in four steps, as shown in fig. 1, each step is called a Message (Msg), and the four steps are called Msg 1-Msg 4 in the related standard.

Wherein:

(1) Msg 1: preamble (preamble) sequences.

The message is an uplink message, is sent by the terminal, is received by the eNB, and is sent by being carried in a Physical Random Access Channel (PRACH). For contention random access, a preamble sequence sent by a terminal is one randomly selected in a specific preamble set, and different preamble sequences have different identification information, i.e., preamble index (index).

(2) Msg 2: random Access Response (RAR).

The message is a downlink message, which is sent by the eNB and received by the terminal.

Msg2 is a response by the eNB to the terminal-initiated random access after receiving Msg1, and must be sent in a random access response window. The starting point of the random access response window is the first available downlink subframe starting from the subframe n +3, n is the number of the last subframe used for sending the preamble, the length of the random access response window is 2-10 ms, and the specific length is specified by the eNB in the system message.

Msg2 is carried on a Downlink Shared Channel (D L-SCH) defined by a Media Access Control (MAC) layer, and corresponds to a Physical Downlink Shared Channel (PDSCH) in a physical layer, an Msg2 can respond to random Access requests of multiple terminals, i.e., simultaneously carry RARs of multiple terminals, so that Msg2 has no Hybrid Automatic repeat request (HARQ) process, i.e., no feedback retransmission process.

The eNB schedules Msg2 by using a Physical Downlink Control Channel (PDCCH) scrambled by a Random access radio Network Temporary Identifier (RA-RNTI) transmitted in a common search space, wherein the RA-RNTI is determined by a PRACH time-frequency resource position for transmitting Msg 1; and calculating by using terminals with the same PRACH time-frequency resource to obtain the same RA-RNTI, packaging RAR information in the same RAR message, transmitting the RAR message in a downlink shared channel which is scheduled by the PDCCH scrambled by the RA-RNTI and scrambling the downlink shared channel by using the RA-RNTI.

the Msg2 includes a backoff (backoff) parameter, identification information of a preamble sequence corresponding to the Msg1, an uplink transmission Timing Advance (TA), an uplink scheduling grant (U L grant, also called RARgrant in a physical layer) of the Msg3, and a Temporary (Temporary) Cell-Radio Network Temporary identifier (C-RNTI), which is abbreviated as TC-RNTI, wherein the backoff parameter is used to indicate a delay mean value of the terminal initiating a random access next time if the random access fails.

the terminal identifies an RAR message (namely Msg2 sent in D L-SCH) carrying the RAR of the terminal through RA-RNTI determined by PRACH time-frequency domain resources used by the preamble sequence sent in the Msg1, the RAR message determines the RAR sent to the terminal according to the identification information of the preamble sequence sent in the Msg1, if the terminal does not correctly receive the Msg2, the time delay of next random access is determined according to the time delay limit of a backoff parameter, in addition, random access resources are selected to initiate the next random access, after the maximum random access times are reached, the MAC layer of the terminal reports the random access problem to the RRC layer, and a Radio L ink Failure (R L F) process is triggered.

(3) Msg 3: uplink transmission is scheduled for the first time.

The message is an uplink message and is sent by the terminal and received by the eNB.

after receiving the Msg2, the terminal performs Uplink transmission on the Uplink resource indicated by the U L grant (i.e., RAR grant) included in the obtained RAR itself, that is, transmits a Physical Uplink Shared Channel (PUSCH) according to the scheduling information in the RAR grant itself, and the PUSCH corresponds to an Uplink Shared Channel (U L-SCH) of the MAC layer.

The initial transmission of Msg3 is the only uplink transmission dynamically scheduled by the MAC layer, requiring MAC layer processing, so Msg3 is at least 6ms apart from Msg2, and the retransmissions of the other Msg3 are all done by PDCCH, which is transmitted in the common search space and scrambled using TC-RNTI.

(4) Msg 4: and (5) resolving the competition.

the eNB and the terminal complete final contention resolution through Msg4 (so-called contention, namely different terminals select the same preamble sequence and the same PRACH time-frequency domain resource when Msg1 sends), the content of Msg4 corresponds to the content of Msg3, Msg4 carries on D L-SCH defined by MAC layer, and corresponds to PDSCH in physical layer, one Msg4 can only respond to contention resolution message of a group of contended terminals (only one terminal succeeds actually), a downlink control channel carrying scheduling information of Msg4 is transmitted in terminal-specific search space, TC-RNTI or C-RNTI is used for scrambling, and the specific RNTI is used depends on the trigger reason and scene of contention access.

The terminal starts a contention resolution timer (mac-ContentionResolutionTimer) after sending Msg3 and restarts the contention resolution timer each time Msg3 retransmits. If contention resolution is not completed until the contention resolution timer times out, contention resolution is considered to be failed. If contention resolution fails, similar to the operation of Msg2 receiving failure: and determining the time delay of the next random access initiation according to the time delay limit of the backoff parameter, and additionally selecting random access resources to initiate the next random access. And after the maximum random access times are reached, the terminal MAC layer reports the random access problem to the RRC layer and triggers the radio link failure process.

with the rise of the internet of things, more and more attention is paid to supporting Machine Type Communication (MTC) in a long Term Evolution (L ong Term Evolution, L TE) system, a 3rd generation Partnership Project (3 GPP) Release 13 Project has been established for enhancing the physical layer of MTC, an MTC device (or MTC terminal) may have some characteristics among various Machine to Machine (M2M) Communication characteristics, such as low mobility, small amount of transmission data, insensitivity to Communication delay, requirement for extremely low power consumption, and the like.

In the existing network, an operator finds that a terminal working in some scenes, such as a terminal working in a basement, a mall or a corner of a building, cannot communicate with the network because a wireless signal is severely shielded and is greatly attenuated, and the network construction cost is greatly increased by performing deep coverage on the network in the scenes. Tests have shown that a certain degree of enhancement of existing coverage is required. A feasible method for implementing coverage enhancement is to adopt repeated transmission or similar techniques to the existing channel, and theoretically, a certain coverage gain can be obtained by performing repeated transmission several tens to several hundreds times to the existing physical channel.

Considering that the time domain and frequency domain resources used by PRACH access and the preamble sequence are needed to distinguish the coverage enhancement level (level) of the terminal in the MTC system. The conventional coverage mode (coverage enhancement level 0) does not need repeated transmission, the PRACH between different levels of coverage enhancement has different times of starting repeated transmission and different times of repeated transmission, the downlink control channels scrambled by RA-RNTI for scheduling random access response in the process of Msg2 have different times of starting repeated transmission and different times of repeated transmission, therefore, the downlink control channels scrambled by RA-RNTI corresponding to terminals with different coverage enhancement levels can have partial overlap in transmission time during repeated transmission, according to the transmission of the prior art, resource conflict can occur, so that part of the terminals do not have the downlink control channels scrambled by RA-RNTI for resource transmission, and can not receive random access response, and the terminals need to blindly detect different downlink control channels candidate to obtain their own scheduling signaling, so that certain power waste exists, at present, no clear method exists how to avoid resource conflict of the downlink control channel scrambled by the RA-RNTI corresponding to different coverage enhancement levels. Similarly, in the Msg4 process, a part of downlink control channels scrambled by TC-RNTI of the Msg4 may also be scheduled, and according to the transmission in the prior art, a resource conflict may occur, and in the prior art, the downlink control channels may be transmitted in a terminal dedicated search space, but configuration information of the dedicated search space cannot be obtained when MTC is initially randomly accessed, so that a part of terminals cannot receive a contention resolution message because no resource is used to transmit the downlink control channels scrambled by TC-RNTI.

Disclosure of Invention

The embodiment of the invention provides a method and a device for transmitting random access responses, which are used for ensuring that the random access responses with different coverage enhancement levels are independently transmitted, reducing the blind detection of a terminal on a physical downlink control channel and saving the power consumption of the terminal.

On the network side, a method for transmitting a random access response provided by the embodiment of the present invention includes:

A network side determines the frequency domain resources of a physical downlink control channel at least according to the coverage enhancement level corresponding to the physical downlink control channel, wherein the frequency domain resources of the physical downlink control channel with different coverage enhancement levels are independently configured;

And the network side sends the physical downlink control channel on the frequency domain resource of the physical downlink control channel.

According to the method, a network side determines the frequency domain resources of a physical downlink control channel at least according to the coverage enhancement level corresponding to the physical downlink control channel, wherein the frequency domain resources of the physical downlink control channel with different coverage enhancement levels are independently configured; the network side sends the physical downlink control channel on the frequency domain resource of the physical downlink control channel, and ensures that random access responses with different coverage enhancement levels are sent independently, thereby reducing blind detection of the terminal on the physical downlink control channel and saving power consumption of the terminal.

Preferably, before the network side determines the frequency domain resource of the physical downlink control channel at least according to the coverage enhancement level corresponding to the physical downlink control channel, the method further includes:

And the network side respectively determines the frequency domain resources of the physical downlink control channels with different coverage enhancement levels and independently notifies the frequency domain resources of the physical downlink control channels with different coverage enhancement levels to the terminal.

Preferably, if the PRACH has a plurality of available frequency domain resources in the same subframe, the network side further determines the frequency domain resources of the physical downlink control channel according to the frequency domain resources used for the PRACH transmission, where the frequency domain resources of the physical downlink control channel corresponding to different PRACH frequency domain resources in the same subframe are independently configured. That is, at this time, it is necessary to determine the frequency domain resources of the physical downlink control channel simultaneously according to the coverage enhancement level corresponding to the physical downlink control channel and the frequency domain resources used for the PRACH transmission, where the frequency domain resources of the physical downlink control channel having different coverage enhancement levels are independently configured, and the frequency domain resources of the physical downlink control channel corresponding to different PRACH frequency domain resources in the same subframe are independently configured for the PRACH corresponding to the same coverage enhancement level.

Preferably, before the network side determines the frequency domain resource of the physical downlink control channel, the method further includes:

And aiming at each coverage enhancement level, the network side determines the frequency domain resources of the physical downlink control channel corresponding to the different PRACH frequency domain resources of the PRACH corresponding to the coverage enhancement level in the same subframe, and independently informs the terminal of the frequency domain resources of the physical downlink control channel corresponding to the different PRACH frequency domain resources of the PRACH corresponding to the coverage enhancement level in the same subframe.

Preferably, the frequency domain resources of the physical downlink control channel are independently notified to the terminal through system information.

Preferably, the coverage enhancement level is embodied as a number of dB of coverage enhancement and/or a number of repeated transmissions; wherein the coverage enhancement levels include regular coverage with a coverage enhancement of 0dB and/or without repeated transmissions, and a plurality of different coverage enhancement levels with a coverage enhancement greater than 0dB and/or a number of repeated transmissions greater than 1; alternatively, the coverage enhancement levels may only include a plurality of different coverage enhancement levels having a coverage enhancement greater than 0dB and/or a number of repeated transmissions greater than 1.

It needs to be further explained that the coverage enhancement level may also correspond to a PRACH resource set, where one PRACH resource set corresponds to one coverage enhancement level, and the PRACH resource set includes a PRACH time-frequency domain resource and a preamble set; therefore, in the present invention, the coverage enhancement level may be replaced by PRACH resource, and the following related contents are the same and will not be described again.

Preferably, the sending, by the network side, the physical downlink control channel on the frequency domain resource of the physical downlink control channel specifically includes:

And the network side sends the physical downlink control channel on the frequency domain resource of the physical downlink control channel according to an Enhanced Physical Downlink Control Channel (EPDCCH) mode.

Preferably, the physical downlink control channel is transmitted in a common search space, and the physical downlink control channel is scrambled by using a random access radio network temporary identifier RA-RNTI or a temporary cell radio network temporary identifier TC-RNTI or a cell radio network temporary identifier C-RNTI.

Preferably, the frequency domain resource of the physical downlink control channel includes:

Narrowband information and/or ECCE number information of the physical downlink control channel transmission;

Or, the common search space where the physical downlink control channel is transmitted. Wherein the common search space is embodied as a narrow band or a partial PRB in a narrow band. That is, when the common search space is configured specifically, the narrowband number and/or the PRB number may be configured directly, or even configured in a smaller unit, such as ECCE, and the following related content is the same, and is not described again.

The method for transmitting the random access response provided by the embodiment of the invention comprises the following steps:

The terminal determines the frequency domain resources of the physical downlink control channel at least according to the coverage enhancement level corresponding to the physical downlink control channel, wherein the frequency domain resources of the physical downlink control channel with different coverage enhancement levels are independently configured;

And the terminal receives the physical downlink control channel on the frequency domain resource of the physical downlink control channel.

Preferably, before the terminal determines the frequency domain resource of the physical downlink control channel at least according to the coverage enhancement level corresponding to the physical downlink control channel, the method further includes:

The method comprises the steps of obtaining configuration information of frequency domain resources of physical downlink control channels which independently indicate different coverage enhancement levels, and obtaining the frequency domain resources of the physical downlink control channels with different coverage enhancement levels according to the configuration information.

Preferably, if the PRACH corresponding to the coverage enhancement level has a plurality of available frequency domain resources in the same subframe, the terminal further determines the frequency domain resources of the physical downlink control channel according to the frequency domain resources used for PRACH transmission of the terminal, where the frequency domain resources of the physical downlink control channel corresponding to different PRACH frequency domain resources in the same subframe are independently configured for the PRACH corresponding to the coverage enhancement level. That is, at this time, it is necessary to determine the frequency domain resources of the physical downlink control channel simultaneously according to the coverage enhancement level corresponding to the physical downlink control channel and the frequency domain resources used for the PRACH transmission, where the frequency domain resources of the physical downlink control channel having different coverage enhancement levels are independently configured, and the frequency domain resources of the physical downlink control channel corresponding to different PRACH frequency domain resources in the same subframe are independently configured for the PRACH corresponding to the same coverage enhancement level.

Preferably, before the terminal determines the frequency domain resource of the physical downlink control channel according to the frequency domain resource used by the PRACH transmission of the terminal, the method further includes:

And acquiring configuration information for independently indicating frequency domain resources of physical downlink control channels corresponding to different PRACH frequency domain resources of the PRACH corresponding to each coverage enhancement level in the same subframe, and acquiring the frequency domain resources of the physical downlink control channels corresponding to the different PRACH frequency domain resources of the PRACH corresponding to each coverage enhancement level in the same subframe according to the configuration information.

Preferably, the configuration information indicating the frequency domain resource of the physical downlink control channel is acquired through system information.

Preferably, the receiving, by the terminal, the physical downlink control channel on the frequency domain resource of the physical downlink control channel specifically includes:

And the terminal receives the physical downlink control channel on the frequency domain resource of the physical downlink control channel according to an Enhanced Physical Downlink Control Channel (EPDCCH) mode.

Preferably, the physical downlink control channel is transmitted in a common search space and scrambled by using a random access radio network temporary identifier RA-RNTI or a temporary cell radio network temporary identifier TC-RNTI or a cell radio network temporary identifier C-RNTI.

On the network side, a transmission apparatus for random access response provided in an embodiment of the present invention includes:

A frequency domain resource determining unit, configured to determine, at least according to a coverage enhancement level corresponding to a physical downlink control channel, a frequency domain resource of the physical downlink control channel, where the frequency domain resources of the physical downlink control channels with different coverage enhancement levels are independently configured;

A sending unit, configured to send the physical downlink control channel on the frequency domain resource of the physical downlink control channel.

Preferably, before determining the frequency domain resource of the physical downlink control channel at least according to the coverage enhancement level corresponding to the physical downlink control channel, the frequency domain resource determining unit is further configured to:

And respectively determining the frequency domain resources of the physical downlink control channels with different coverage enhancement levels, and independently notifying the frequency domain resources of the physical downlink control channels with different coverage enhancement levels to the terminal.

Preferably, if the PRACH has a plurality of available frequency domain resources in the same subframe, the frequency domain resource determining unit further determines the frequency domain resource of the physical downlink control channel according to the frequency domain resource used for the PRACH transmission, where the frequency domain resources of the physical downlink control channel corresponding to different PRACH frequency domain resources in the same subframe are independently configured.

Preferably, before the frequency domain resource determining unit determines the frequency domain resource of the physical downlink control channel, the frequency domain resource determining unit is further configured to:

And for each coverage enhancement level, determining the frequency domain resources of the physical downlink control channel corresponding to the different PRACH frequency domain resources of the PRACH corresponding to the coverage enhancement level in the same subframe, and independently notifying the frequency domain resources of the physical downlink control channel corresponding to the different PRACH frequency domain resources of the PRACH corresponding to the coverage enhancement level in the same subframe to the terminal.

Preferably, the frequency domain resource determining unit independently notifies the terminal of the frequency domain resource of the physical downlink control channel through system information.

Preferably, the sending unit sends the physical downlink control channel according to an enhanced physical downlink control channel EPDCCH method on a frequency domain resource of the physical downlink control channel.

Preferably, the sending unit transmits the physical downlink control channel in a common search space, and scrambles the physical downlink control channel by using a random access radio network temporary identifier RA-RNTI or a temporary cell radio network temporary identifier TC-RNTI or a cell radio network temporary identifier C-RNTI.

Or, the common search space where the physical downlink control channel is transmitted.

On the terminal side, a transmission apparatus for random access response provided in an embodiment of the present invention includes:

A receiving unit, configured to receive the physical downlink control channel on the frequency domain resource of the physical downlink control channel.

Preferably, before the frequency domain resource determining unit determines the frequency domain resource of the physical downlink control channel at least according to the coverage enhancement level corresponding to the physical downlink control channel, the frequency domain resource determining unit is further configured to:

Preferably, if the PRACH corresponding to the coverage enhancement level has a plurality of available frequency domain resources in the same subframe, the frequency domain resource determining unit further determines the frequency domain resource of the physical downlink control channel according to the frequency domain resource used for PRACH transmission by the terminal, where the frequency domain resource of the physical downlink control channel corresponding to different PRACH frequency domain resources in the same subframe is independently configured for the PRACH corresponding to the coverage enhancement level.

Preferably, before the frequency domain resource determining unit further determines the frequency domain resource of the physical downlink control channel according to the frequency domain resource used for PRACH transmission by the terminal, the frequency domain resource determining unit is further configured to:

Preferably, the receiving unit receives the physical downlink control channel according to an enhanced physical downlink control channel EPDCCH method on a frequency domain resource of the physical downlink control channel.

Drawings

Fig. 1 is a schematic diagram of a contention random access procedure in the prior art;

Fig. 2 is a schematic transmission diagram of msg2 according to embodiment 1 of the present invention;

Fig. 3 is a schematic diagram of the partition of an EPDCCH common search space according to an embodiment of the present invention;

Fig. 4 is another schematic diagram of the partition of an EPDCCH common search space according to an embodiment of the present invention;

Fig. 5 is a schematic transmission diagram of msg4 according to embodiment 2 of the present invention;

Fig. 6 is a flowchart illustrating a method for transmitting a random access response on a network side according to an embodiment of the present invention;

Fig. 7 is a flowchart illustrating a method for transmitting a random access response at a terminal according to an embodiment of the present invention;

Fig. 8 is a schematic structural diagram of a transmission apparatus for a random access response at a network side according to an embodiment of the present invention;

Fig. 9 is a schematic structural diagram of an apparatus for transmitting a random access response at a terminal according to an embodiment of the present invention;

Fig. 10 is a schematic structural diagram of another apparatus for transmitting a random access response at a network side according to an embodiment of the present invention;

Fig. 11 is a schematic structural diagram of another apparatus for transmitting a random access response at a terminal according to an embodiment of the present invention.

Detailed Description

In the embodiment of the present invention, for a conventional coverage and different coverage enhancement levels, or only for different coverage enhancement levels, a network side (e.g., a base station) separately configures frequency domain resources for transmitting a RA-RNTI-scrambled downlink control channel, and notifies (e.g., via system information) to a terminal, and the terminal selects to detect the RA-RNTI-scrambled downlink control channel on the corresponding frequency domain resources according to its coverage condition, i.e., according to whether the terminal is in a conventional coverage mode or an enhanced coverage mode, and specifically, according to which level of the enhanced coverage mode if the terminal is in the enhanced coverage mode.

Wherein:

If the PRACH resource corresponding to the conventional coverage or the coverage enhancement level has a plurality of available frequency domain resource positions in a frequency domain in the same subframe, independently configuring the frequency domain resource for transmitting the downlink control channel scrambled by the RA-RNTI for each frequency domain resource position;

The downlink control Channel is transmitted according to an Enhanced Physical Downlink Control Channel (EPDCCH);

The frequency domain resource comprises narrowband information and/or Enhanced Control Channel Element (ECCE) number information; or, the frequency domain resource is a common search space (which includes more ECCEs, so that the same common search space can be multiplexed by multiple terminals in the enhanced coverage mode of the same level, and each terminal determines the frequency domain resource corresponding to its RA-RNTI through blind detection in the common search space);

The number of ECCEs used for transmitting the EPDCCH scrambled by the RA-RNTI corresponding to the terminals with different coverage conditions can be the same or different, and can be continuous or discontinuous;

When the frequency domain resource is a public search space, the terminal blindly detects a downlink control channel scrambled by the corresponding RA-RNTI in the public search space; the common search space can support multiplexing transmission of a plurality of RA-RNTIs scrambled downlink control channels with the same coverage condition and different terminals with RA-RNTIs;

When the downlink control channel is in the normal coverage mode, the transmission time of the downlink control channel scrambled by the RA-RNTI is a first available downlink subframe starting from a subframe N + k, or a subframe in a random access response window with a length of N starting from the first available downlink subframe starting from the subframe N + k, where N is a last subframe in subframes for transmitting the PRACH corresponding to the RA-RNTI, N is a preconfigured random access response window length, and k is a processing delay, for example, k is 3; namely, the terminal detects the downlink control channel scrambled by the RA-RNTI in the first available downlink subframe starting from the subframe N + k, or blindly detects the downlink control channel scrambled by the RA-RNTI in each downlink subframe in a random access response window with the length of N starting from the first available downlink subframe starting from the subframe N + k.

When the coverage is enhanced, the transmission subframe set of the downlink control channel scrambled by the RA-RNTI starts from a first available downlink subframe starting from a subframe n + k, and comprises a set of downlink subframes with repeated transmission times corresponding to the coverage enhancement level, wherein n is the last subframe in the subframes for repeatedly transmitting the PRACH corresponding to the RA-RNTI.

A description of several specific embodiments is given below.

Example 1: msg1 and msg2 transmissions for normal coverage and terminals with different coverage enhancement levels are shown in fig. 2, where at least one of preamble, time domain location and frequency domain location used by the normal coverage terminal and the terminals with different coverage enhancement levels are different; the timing relationship between msg1 and msg2 for both normal coverage and terminals with different coverage enhancement levels is determined according to the respective last preamble transmission subframe n + 3; wherein the content of the first and second substances,

One of the situations is: the SIB information informs in advance the following information:

EPDCCH scrambled by RA-RNTI of a conventional coverage terminal is transmitted in ECCE 0-ECCE 2 in narrow band 0;

EPDCCH scrambled by RA-RNTI covering the enhancement level 1 terminal is transmitted in ECCE 3-ECCE 5 in narrow band 0;

EPDCCH scrambled by RA-RNTI covering the enhancement level 2 terminal is transmitted in ECCE 6-ECCE 9 in narrow band 0;

EPDCCH scrambled by RA-RNTI covering the enhancement level 3 terminal is transmitted in ECCE 10-ECCE 15 in narrow band 0;

The EPDCCH occupies the corresponding ECCE in each subframe for transmission, the terminal does not need to detect the EPDCCH of the terminal in a blind manner, and the EPDCCH scrambled by the RA-RNTI on the corresponding frequency domain resources is directly received according to the RA-RNTI and the starting subframe determined at the timing of n + 3; because the transmission frequency domain resources of the EPDCCH scrambled by RA-RNTI of the terminals with the normal coverage and different coverage enhancement grades are independent and do not overlap with each other, although the different EPDCCHs are overlapped in transmission time, the resource conflict does not occur; the narrow bands configured by the terminals with different coverage conditions may be the same or different, the positions of the narrow bands may be other narrow bands, and the number of ECCEs used for transmitting the EPDCCH scrambled by the RA-RNTI corresponding to the terminals with different coverage conditions may be the same or different, and may be continuous or discontinuous, and is not limited to the example values given above.

In another case: the SIB information informs in advance the following information:

An EPDCCH scrambled by an RA-RNTI of a conventional overlay terminal is transmitted in a common search space 0 (where the common search space 0 may be defined as 6 RBs in a narrowband i, or X RBs in a system bandwidth, where X is less than or equal to 6, and the following definitions of the common search space are similar and are not repeated);

An EPDCCH scrambled by RA-RNTI covering an enhancement level 1 terminal is transmitted in a common search space 1;

An EPDCCH scrambled by RA-RNTI covering an enhancement level 2 terminal is transmitted in a common search space 1;

An EPDCCH scrambled by RA-RNTI of a coverage enhancement grade 3 terminal is transmitted in a common search space 2;

At this time, the candidate EPDCCH included in one common search space may be divided as shown in fig. 3 or fig. 4, where an EPDCCH scrambled by an RA-RNTI occupies one of the candidate EPDCCH transmission windows (a subframe filled in the same filling manner is used in the figure), an EPDCCH scrambled by an RA-RNTI corresponding to different coverage situations is configured with an independent ECCE aggregation level and a retransmission subframe number (the subframe number is 1 for normal coverage), that is, the EPDCCH region is transmitted in a candidate EPDCCH region filled in a different filling manner corresponding to the ECCE aggregation level and the retransmission subframe number configured in fig. 3 or fig. 4, and the terminal does not know which part of the EPDCCH scrambled by its RA-RNTI is transmitted in the candidate EPDCCH region corresponding to its ECCE aggregation level or the retransmission subframe number, and needs to transmit the EPDCCH according to its RA-RNTI and the aggregation level and the retransmission subframe number corresponding to the EPDCCH, blind-detecting the EPDCCH of the candidate EPDCCH filled in the different filling manners corresponding to the aggregation level and the number of the retransmission subframes shown in fig. 3 or 4; the RA-RNTIs of terminals transmitted in the same common search space need to be different, for example, the level 1 and level 2 terminals multiplex the common search space 1, and then the RA-RNTIs of the level 1 terminal and the level 2 terminal are different, and the base station may map the EPDCCH scrambled by the RA-RNTIs of the level 1 and level 2 terminals to candidate EPDCCH regions filled in different filling manners partitioned according to the partitioning manner shown in fig. 3 or fig. 4 in the common search space 1 for transmission, for example, according to the TDM partitioning manner shown in fig. 3: the base station configures an ECCE aggregation level of 24 in advance for a terminal of level 1, and the number of retransmission subframes is 4, then an RA-RNTI scrambled EPDCCH of the terminal of level 1 may be transmitted at one of the candidate EPDCCH positions (shown in the upper diagram of fig. 3) filled in different filling manners corresponding to 24 ECCE aggregation levels and 4 retransmission subframes in fig. 3, the base station may select one of the candidate EPDCCH positions to transmit the RA-RNTI scrambled EPDCCH of the terminal of level 1, for example, the base station selects the EPDCCH of the terminal of level 1 at the second candidate EPDCCH position (i.e. in the 5 th to 8 th subframes in the upper diagram of fig. 3) in the upper diagram of fig. 3, and the terminal of level 1 can only determine that it will only transmit at the candidate EPDCCH position shown in the upper diagram of fig. 3 but cannot determine which 4 subframes to transmit specifically according to the ECCE aggregation level configured by the EPDCCH and the number of retransmission subframes, therefore, a terminal of level 1 needs to perform blind detection on an EPDCCH scrambled by an RA-RNTI of the candidate EPDCCH region filled in different filling manners shown in the upper diagram of fig. 3, that is, an EPDCCH scrambled by an RA-RNTI is detected once for 24 ECCEs according to an aggregation level in the 1 st to 4 th subframes (that is, an EPDCCH is received on 24 ECCEs in the 1 st to 4 th subframes respectively, received information in a plurality of subframes is combined, and finally CRC check judgment is performed, if the EPDCCH passes, the EPDCCH is correct, otherwise, the processing in the subsequent process is the same as that in the previous step, and is not repeated again), if the EPDCCH is not detected, the EPDCCH scrambled by an RA-RNTI is further detected once for 24 ECCEs according to the aggregation level in the 5 th to 8 th subframes, and so on until the EPDCCH is detected; the base station configures an ECCE aggregation level of 24 in advance for a terminal of level 2, and the number of retransmission subframes is 8, then an RA-RNTI scrambled EPDCCH of the terminal of level 2 may be transmitted at one of the candidate EPDCCH positions (shown in the middle diagram of fig. 3) filled in different filling manners corresponding to the 24 ECCE aggregation levels and the 8 retransmission subframes in fig. 3, the base station may select one of the candidate EPDCCH positions to transmit the RA-RNTI scrambled EPDCCH of the terminal of level 2, for example, the base station selects the second candidate EPDCCH position (i.e. 9 th to 16 th subframes in the middle diagram of fig. 3) in the middle diagram of fig. 3 to transmit the EPDCCH of the terminal of level 2, the terminal of level 2 can only determine that it will only transmit at the candidate EPDCCH position shown in the middle diagram of fig. 3 according to the ECCE aggregation level configured by the EPDCCH and the number of retransmission subframes, but cannot determine which 8 subframes are specifically transmitted, therefore, a terminal of level 2 needs to perform blind detection on an EPDCCH scrambled by an RA-RNTI of the candidate EPDCCH region filled in different filling manners shown in the middle diagram of fig. 3, that is, an EPDCCH scrambled by an RA-RNTI is detected once for 24 ECCEs according to an aggregation level in the 1 st to 8 th subframes (that is, an EPDCCH is received on 24 ECCEs in the 1 st to 8 th subframes respectively, received information in a plurality of subframes is combined, and finally CRC check judgment is performed, if the EPDCCH passes through, the EPDCCH is correct, otherwise, the processing in the subsequent process is the same as that in the first to 8 th subframes, and is not repeated again); for example, according to the FDM partition shown in fig. 4, the base station configures an ECCE aggregation level of 6 in advance for a terminal of level 1, and the number of repeatedly transmitted subframes is 16, then the RA-RNTI scrambled EPDCCH of the terminal of level 1 may be transmitted at one of the candidate EPDCCH positions (shown in the upper diagram of fig. 4) filled in different filling manners corresponding to the 6 ECCE aggregation levels and the 16 repeatedly transmitted subframes in fig. 4, the base station may select one of the candidate EPDCCH positions to transmit the RA-scrambled EPDCCH of the terminal of level 1, for example, the base station selects the second candidate EPDCCH position in the upper diagram of fig. 4 (i.e., the 16 subframes corresponding to the 2 nd group of 6 ECCE frequency domain resources from top to bottom in the upper diagram of fig. 4) to transmit the EPDCCH of the terminal of level 1, and the terminal of level 1 can only determine that the EPDCCH thereof will only transmit the EPDCCH candidate EPDCCH at the EPDCCH position shown in the upper diagram of fig. 4 according to the configured epdce aggregation level and the repeatedly transmitted EPDCCH, however, it cannot be determined which 6 ECCEs are specifically transmitted, so a terminal of level 1 needs to blindly detect an EPDCCH scrambled by an RA-RNTI in a candidate EPDCCH region filled in different filling manners shown in the upper diagram of fig. 4, that is, detect an EPDCCH scrambled by an RA-RNTI in one time in 16 subframes on 6 ECCE resources of the 1 st group from top to bottom (or from bottom to top) (i.e., receive an EPDCCH on 6 ECCEs of the 1 st group in 16 subframes respectively, combine received information in multiple subframes, and finally perform CRC check judgment, if the EPDCCH passes, the EPDCCH is correct, otherwise, the subsequent process is not repeated herein, and if the EPDCCH is not detected, further detect an EPDCCH scrambled by an RA-RNTI in 16 subframes on 6 ECCE resources of the 2 nd group, and so on until an EPDCCH is detected; the base station configures an ECCE aggregation level of 12 for a terminal of level 2 in advance, and the number of retransmission subframes is 16, then an RA-RNTI scrambled EPDCCH of the terminal of level 2 may be transmitted at one of the candidate EPDCCH positions (shown in the middle diagram of fig. 4) filled in different filling manners corresponding to the 12 ECCE aggregation levels and the 16 retransmission subframes in fig. 4, the base station may select one of the candidate EPDCCH positions to transmit the RA-RNTI scrambled EPDCCH of the terminal of level 2, for example, the base station selects the EPDCCH of the terminal of level 2 at the second candidate EPDCCH position in the middle diagram of fig. 4 (i.e. in the 16 subframes corresponding to the 12 ECCE frequency domain resources of the 2 nd group from top to bottom in the middle diagram of fig. 4), and the terminal of level 2 can only determine that the EPDCCH thereof will only be transmitted at the candidate EPDCCH position shown in the middle diagram of fig. 4 according to the configured ECCE aggregation level and the number of retransmission subframes, however, it cannot be determined which 12 ECCEs are specifically transmitted, so a terminal of class 2 needs to blindly detect an EPDCCH scrambled by an RA-RNTI in a candidate EPDCCH region filled in different filling manners shown in the middle diagram of fig. 4, that is, detect an EPDCCH scrambled by an RA-RNTI in 16 subframes on 12 ECCE resources of the 1 st group from top to bottom (or from bottom to top) (i.e., receive an EPDCCH on 12 ECCEs of the 1 st group in 16 subframes respectively, combine received information in multiple subframes, and finally perform CRC check judgment, if the EPDCCH passes, the EPDCCH is correct, otherwise, the subsequent process is not repeated herein, and if the EPDCCH is not detected, further detect an EPDCCH scrambled by an RA-RNTI in 16 subframes on 12 ECCE resources of the 2 nd group, and so on until an EPDCCH is detected; (ii) a If for the same coverage situation, for example, coverage class 3 configures multiple PRACH frequency domain resources in the same subframe, RA-RNTIs corresponding to different class 3 terminals using different PRACH frequency domain resources for transmission in the same subframe are different, and the EPDCCH scrambled by the RA-RNTI is multiplexed and transmitted in the common search space 2 in the same way as class 1 and class 2 are multiplexed and transmitted in the common search space 1. Because the transmission frequency domain resources of the EPDCCH scrambled by the RA-RNTI of the terminals covered by the conventional coverage and the enhanced coverage are independent and do not overlap with each other, even though the EPDCCHs scrambled by the RA-RNTI of the terminals covered by the conventional coverage and the enhanced coverage are overlapped in transmission time, resource conflicts can not occur, the EPDCCHs scrambled by the RA-RNTI of the terminals of the level 1 and the level 2 share the same common search space for coverage enhancement level 1 and level 2, and can be transmitted in different candidate EPDCCH areas according to different configurations of ECCE aggregation levels and repeated transmission subframe numbers, so the conflicts can not occur; the configuration mode of the common search space for different coverage situations is not limited to the examples given in the present invention, and the common search space with completely independent configuration is included in the present invention by changing the position of the common search space or changing the multiplexing of different coverage situations in the same common search space or different coverage situations.

Fig. 3 only uses 4, 8, and 16 subframes for example to divide the space, and other dividing manners of the number of subframes for repeated transmission and manners of including more candidates in the time domain are also included in the present embodiment; fig. 4 only uses 6, 12, and 24 ECCE aggregation levels as examples to divide the space, and other division manners of aggregation level numbers and cases where the number of subframes in the time domain is greater than or less than 16 subframes are also included in this example.

Example 2: msg3 and msg4 transmissions for normal coverage and terminals with different levels of coverage enhancement are shown in fig. 5; the timing relationship between Msg3 and Msg4 for both normal coverage and terminals with different coverage enhancement levels is determined according to the respective last Msg3 transmission subframe n + 3; wherein the content of the first and second substances,

The SIB information informs in advance the following information:

EPDCCH scrambled by TC-RNTI of a conventional coverage terminal is transmitted in a common search space 0;

EPDCCH scrambled by TC-RNTI covering the enhancement level 1 terminal is transmitted in a common search space 1;

EPDCCH scrambled by TC-RNTI covering the enhancement level 2 terminal is transmitted in a common search space 2;

EPDCCH scrambled by TC-RNTI covering the enhancement grade 3 terminal is transmitted in a common search space 3;

A dividing manner of candidate EPDCCH included in a common search space may also be, as shown in fig. 3 or fig. 4, where an EPDCCH scrambled by one TC-RNTI occupies one of candidate EPDCCH transmission windows (subframes filled in the same filling manner are used in the figure), and TC-RNTIs corresponding to different terminals under the same coverage condition are different, and the same ECCE aggregation level and retransmission subframe number may be configured, and an EPDCCH hcandidate (i.e., an area filled in different filling manners corresponding to the ECCE aggregation level and the retransmission subframe number in fig. 3 or fig. 4) corresponding to the ECCE aggregation level and the retransmission subframe number is occupied for transmission, so as to support multiplexing transmission of MSg4 scheduling signaling of different terminals in the same coverage enhancement level; the terminal does not know which part of the EPDCCH scrambled by the TC-RNTI of the terminal is transmitted in the candidate EPDCCH region corresponding to the ECCE aggregation level or the repeated transmission subframe number of the EPDCCH, and needs to blindly detect the EPDCCH of the terminal according to the TC-RNTI of the terminal, the aggregation level and the repeated transmission subframe number corresponding to the EPDCCH and the candidate EPDCCH position filled in different filling modes corresponding to the ECCE aggregation level and the repeated transmission subframe number of the terminal in the figure 3 or the figure 4; for example, for coverage enhancement level 1, terminal 1 corresponds to TC-RNTI-1, terminal 2 corresponds to TC-RNTI-2, terminal 3 corresponds to TC-RNTI-3, and common search space 1 is multiplexed, then according to the TDM multiplexing mode shown in fig. 3, the repetition times of EPDCCH configured for terminals 1, 2, 3 are 4 subframes, and ECCEs occupy 24 subframes, then the base station may map EPDCCH scrambled by TC-RNTI of terminals 1, 2, 3 in any 3 of regions (i.e. 4 different filling regions in the upper drawing of fig. 3) filled in the common search space 1 according to 4 different filling modes corresponding to 24 ECCE aggregation levels and 4 retransmission subframe numbers in fig. 3, respectively, but the terminal does not know where the EPDCCH is located, and needs to blindly detect the corresponding EPDCCH according to its own-RNTI in the region filled with 4 different filling modes corresponding to 24 ECCE aggregation levels and 4 retransmission subframe numbers in fig. 3 (ii) a Or according to the FDM multiplexing mode shown in fig. 4, the repetition times of EPDCCH configuration by terminals 1, 2, and 3 are 16 subframes, and ECCEs occupy 6 subframes, then the base station may map the EPDCCH scrambled by TC-RNTI of terminals 1, 2, and 3 in any 3 of 4 different color regions (4 different filling regions in the upper drawing of fig. 4) corresponding to 6 ECCE aggregation levels and retransmission subframe numbers 16 in fig. 4 in the common search space 1, respectively, but the terminal does not know where the EPDCCH is located, and needs to detect the corresponding EPDCCH according to its TC-blind in the region filled with 4 different filling modes corresponding to 6 ECCE aggregation levels and retransmission subframe numbers 16 in fig. 4; since the transmission frequency domain resources of the TC-RNTI scrambled EPDCCHs of the terminals with different coverage enhancement levels with the conventional coverage and coverage enhancement larger than 0dB are independent and do not overlap, no resource conflict occurs even though the TC-RNTI scrambled EPDCCHs of the terminals with the conventional coverage and coverage enhancement larger than 0dB are overlapped in transmission time. The configuration mode of the common search space for different coverage situations is not limited to the examples given in the present invention, and the common search space with completely independent configuration is included in the present invention by changing the position of the common search space or changing the multiplexing of different coverage situations in the same common search space or different coverage situations.

Therefore, on the network side, referring to fig. 6, an embodiment of the present invention provides a method for transmitting a random access response, including:

S101, a network side determines frequency domain resources of a physical downlink control channel at least according to a coverage enhancement level corresponding to the physical downlink control channel, wherein the frequency domain resources of the physical downlink control channel with different coverage enhancement levels are independently configured;

S102, the network side sends the physical downlink control channel on the frequency domain resource of the physical downlink control channel.

Preferably, if the PRACH has a plurality of available frequency domain resources in the same subframe, the network side further determines the frequency domain resources of the physical downlink control channel according to the frequency domain resources used for the PRACH transmission, wherein the frequency domain resources of the physical downlink control channel corresponding to different PRACH frequency domain resources in the same subframe are independently configured; for example, for the same coverage enhancement level, the PRACH configures 2 or more PRACH frequency domain resources in the same subframe, and a terminal may randomly select one of the PRACH resources for transmission, and then different terminals under the coverage enhancement level may select different PRACH frequency domain resources in the same subframe for simultaneous transmission of the PRACH, and the PRACH repeated transmission subframes of the terminals are the same, and according to the same timing relationship between Msg1 and Msg2, Msg2 of the terminals also transmit simultaneously and Msg4 also transmit simultaneously, and if Msg2/Msg4 resources of the terminals are shared, there may be a resource conflict, resulting in that part of the terminals do not have resources to transmit Msg2/Msg4, and therefore, a plurality of frequency domain resources of the PRACH in the same subframe are also respectively configured with frequency domain resources of a plurality of different physical downlink control channels, so that when the terminal 1 selects PRACH frequency domain resource 1 for transmission, it schedules a physical downlink control channel of the RAR and/or schedules a downlink physical control channel of the Msg4 in a physical control channel corresponding to PRACH resource of the frequency domain 1 And when the terminal 2 selects the PRACH frequency domain resource 2 for transmission, it schedules the physical downlink control channel of the RAR and/or schedules the physical downlink control channel of the Msg4 for transmission on the physical downlink control channel frequency domain resource 2 corresponding to the PRACH frequency domain resource 2, and so on, thereby ensuring that the physical downlink control channels of different terminals transmitted in the same subframe are transmitted on different frequency domain resources to avoid collision.

That is to say, the physical downlink control channel and the PRACH correspond to the same terminal and correspond to the same coverage enhancement level, for example, the PRACH is a Msg1 procedure of the terminal, that is, a procedure of sending a preamble sequence, and the physical downlink control channel may be a physical downlink control channel that schedules Msg2 in an Msg2 procedure (that is, RAR message transmission) of the terminal or a physical downlink control channel that schedules Msg2 in an Msg4 procedure (that is, contention resolution message transmission) of the terminal, but it is not limited to that the number of times of the repeated transmission of the physical downlink control channel is the same as that of the PRACH, and the number of times of the repeated transmission is determined independently but is related to the coverage enhancement level.

For example:

The first condition is as follows: when the network side determines the frequency domain resources of the physical downlink control channels with different coverage enhancement levels respectively and independently notifies the terminal of the frequency domain resources of the physical downlink control channels with different coverage enhancement levels, the network side notifies the corresponding relationship between the physical downlink control channels with different coverage enhancement levels and the corresponding frequency domain resources, such as a table; or respectively using N bit information to inform each coverage enhancement grade corresponding to the physical downlink control channel of the corresponding frequency domain resource;

Case two: when the network side determines, for each coverage enhancement level, frequency domain resources of physical downlink control channels corresponding to different PRACH frequency domain resources in the same subframe, and independently notifies the terminal of the frequency domain resources of the physical downlink control channels corresponding to the different PRACH frequency domain resources in the same subframe, where the PRACH corresponding to the coverage enhancement level is located: the network side informs the corresponding relation between a plurality of frequency domain resources of the PRACH under each coverage enhancement level and the frequency domain resources of the physical downlink control channel, such as a table; or for each coverage enhancement level, respectively notifying the frequency domain resources of the physical downlink control channel corresponding to each frequency domain resource of the PRACH under the coverage enhancement level by using N bits of information;

When the first case is combined with the second case, different coverage enhancement levels and different PRACH frequency domain resources in each level are all independently corresponding to a frequency domain resource of a physical downlink control channel.

That is, RA-RNTI scrambling corresponds to Msg2 RAR message transmission in the random access process, and is used to carry the scheduling information of the RAR message; TC-RNTI or C-RNTI scrambling corresponds to Msg4 contention resolution message transmission in the random access process and is used for bearing scheduling information of the contention resolution message.

Or, the common search space where the physical downlink control channel is transmitted. In one embodiment, narrow band information and/or ECCE number is configured for a physical downlink control channel scrambled by RA-RNTI, and a common search space is configured for a physical downlink control channel scrambled by TC-RNTI or C-RNTI.

Correspondingly, on the terminal side, referring to fig. 7, a method for transmitting a random access response according to an embodiment of the present invention includes:

S201, a terminal determines frequency domain resources of a physical downlink control channel at least according to a coverage enhancement level corresponding to the physical downlink control channel, wherein the frequency domain resources of the physical downlink control channel with different coverage enhancement levels are independently configured;

S202, the terminal receives the physical downlink control channel on the frequency domain resource of the physical downlink control channel.

Preferably, if the PRACH corresponding to the coverage enhancement level has a plurality of available frequency domain resources in the same subframe, the terminal further determines the frequency domain resources of the physical downlink control channel according to the frequency domain resources used for PRACH transmission of the terminal, where the frequency domain resources of the physical downlink control channel corresponding to different PRACH frequency domain resources in the same subframe are independently configured for the PRACH corresponding to the coverage enhancement level.

Corresponding to the method on the network side, referring to fig. 8, on the network side, the transmission apparatus for random access response according to the embodiment of the present invention includes:

A frequency domain resource determining unit 11, configured to determine, at least according to a coverage enhancement level corresponding to a physical downlink control channel, a frequency domain resource of the physical downlink control channel, where the frequency domain resources of the physical downlink control channels with different coverage enhancement levels are independently configured;

A sending unit 12, configured to send the physical downlink control channel on the frequency domain resource of the physical downlink control channel.

Corresponding to the method at the terminal side, referring to fig. 9, at the terminal side, the transmission apparatus for random access response according to the embodiment of the present invention includes:

A frequency domain resource determining unit 21, configured to determine, at least according to a coverage enhancement level corresponding to a physical downlink control channel, a frequency domain resource of the physical downlink control channel, where the frequency domain resources of the physical downlink control channels with different coverage enhancement levels are independently configured;

A receiving unit 22, configured to receive the physical downlink control channel on a frequency domain resource of the physical downlink control channel.

Referring to fig. 10, on a network side, another transmission apparatus for a random access response according to an embodiment of the present invention, for example, a network device such as a base station, includes:

The processor 500, which is used to read the program in the memory 520, executes the following processes:

Determining frequency domain resources of the physical downlink control channel at least according to a coverage enhancement level corresponding to the physical downlink control channel, wherein the frequency domain resources of the physical downlink control channel with different coverage enhancement levels are independently configured;

The physical downlink control channel is transmitted on the frequency domain resources of the physical downlink control channel through the transceiver 510.

Preferably, before determining the frequency domain resource of the physical downlink control channel at least according to the coverage enhancement level corresponding to the physical downlink control channel, the processor 500 is further configured to:

Frequency domain resources of the physical downlink control channels with different coverage enhancement levels are respectively determined, and are independently notified to the terminal through the transceiver 510.

Preferably, if the PRACH has a plurality of available frequency domain resources in the same subframe, the processor 500 further determines the frequency domain resources of the physical downlink control channel according to the frequency domain resources used for the PRACH transmission, where the frequency domain resources of the physical downlink control channel corresponding to different PRACH frequency domain resources in the same subframe are independently configured.

Preferably, before the processor 500 determines the frequency domain resource of the physical downlink control channel, it is further configured to:

For each coverage enhancement level, the frequency domain resources of the physical downlink control channel corresponding to the different PRACH frequency domain resources in the same subframe corresponding to the coverage enhancement level are determined, and the frequency domain resources of the physical downlink control channel corresponding to the different PRACH frequency domain resources in the same subframe corresponding to the coverage enhancement level are independently notified to the terminal through the transceiver 510.

Preferably, the processor 500 controls the transceiver 510 to independently notify the terminal of the frequency domain resource of the physical downlink control channel through system information.

Preferably, the processor 500 controls the transceiver 510 to transmit the physical downlink control channel according to an enhanced physical downlink control channel EPDCCH on a frequency domain resource of the physical downlink control channel.

Preferably, the processor 500 controls the transceiver 510 to transmit the physical downlink control channel in a common search space, and scrambles the physical downlink control channel using a random access radio network temporary identity RA-RNTI or a temporary cell radio network temporary identity TC-RNTI or a cell radio network temporary identity C-RNTI.

A transceiver 510 for receiving and transmitting data under the control of the processor 500.

Where in fig. 10, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 500 and memory represented by memory 520. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 510 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 500 is responsible for managing the bus architecture and general processing, and the memory 520 may store data used by the processor 500 in performing operations.

Referring to fig. 11, on the terminal side, another apparatus for transmitting a random access response, for example, a UE, provided in the embodiment of the present invention includes:

The processor 600, which is used to read the program in the memory 620, executes the following processes:

The physical downlink control channel is received on frequency domain resources of the physical downlink control channel by the transceiver 610.

Preferably, before the processor 600 determines the frequency domain resource of the physical downlink control channel at least according to the coverage enhancement level corresponding to the physical downlink control channel, the processor is further configured to:

Preferably, if the PRACH corresponding to the coverage enhancement level has a plurality of available frequency domain resources in the same subframe, the processor 600 further determines the frequency domain resources of the physical downlink control channel according to the frequency domain resources used for PRACH transmission by the terminal, where the frequency domain resources of the physical downlink control channel corresponding to different PRACH frequency domain resources in the same subframe are independently configured for the PRACH corresponding to the coverage enhancement level.

Preferably, before the processor 600 further determines the frequency domain resource of the physical downlink control channel according to the frequency domain resource used by the PRACH transmission of the terminal, the frequency domain resource determining unit is further configured to:

Preferably, the processor 600 controls the transceiver 610 to obtain configuration information indicating frequency domain resources of the physical downlink control channel through system information.

Preferably, the processor 600 controls the transceiver 610 to receive the physical downlink control channel according to an enhanced physical downlink control channel EPDCCH method on a frequency domain resource of the physical downlink control channel.

A transceiver 610 for receiving and transmitting data under the control of the processor 600.

Where in fig. 11, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 600 and memory represented by memory 620. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 610 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. For different user devices, the user interface 630 may also be an interface capable of interfacing with a desired device externally, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 may store data used by the processor 600 in performing operations.

In summary, embodiments of the present invention provide a method and an apparatus for transmitting a random access response, where a conventional coverage and a downlink control channel scrambled by an RA-RNTI of a different coverage enhancement class or a random access response to a different coverage enhancement class are transmitted in an FDM manner, so as to avoid resource collision between the conventional coverage and the different coverage enhancement classes, or avoid resource collision between the different coverage enhancement classes, ensure that random access responses of different coverage enhancement classes are transmitted independently, reduce blind detection on the downlink control channel, and improve power utilization.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method for transmitting a random access response, the method comprising:

The network side determines the frequency domain resources of the physical downlink control channel at least according to the coverage enhancement level corresponding to the physical downlink control channel, wherein the frequency domain resources of the physical downlink control channel with different coverage enhancement levels are independently notified to the terminal by the network side; the physical downlink control channel is used for scheduling a Physical Downlink Shared Channel (PDSCH) carrying a Random Access Response (RAR);

The network side sends the physical downlink control channel on the frequency domain resource of the physical downlink control channel;

Before the network side determines the frequency domain resource of the physical downlink control channel at least according to the coverage enhancement level corresponding to the physical downlink control channel, the method further includes:

The network side respectively determines the frequency domain resources of the physical downlink control channels with different coverage enhancement levels and independently informs the frequency domain resources of the physical downlink control channels with different coverage enhancement levels to the terminal through system information;

Wherein independently notifying the terminal of the frequency domain resources of the physical downlink control channel specifically comprises:

The network side informs the corresponding relation between the physical downlink control channels with different coverage enhancement levels and the corresponding frequency domain resources; or respectively using N-bit information to inform the corresponding frequency domain resources of each coverage enhancement level corresponding to the physical downlink control channel.

2. The method of claim 1, wherein if a Physical Random Access Channel (PRACH) corresponding to the coverage enhancement level has multiple available frequency domain resources in a same subframe, the network side further determines the frequency domain resources of the physical downlink control channel according to the frequency domain resources used for PRACH transmission, wherein the frequency domain resources of the physical downlink control channel corresponding to different PRACH frequency domain resources in the same subframe are independently notified to a terminal by the network side.

3. The method according to claim 2, wherein before the network side determines the frequency domain resources of the physical downlink control channel, the method further comprises:

For each coverage enhancement level, the network side determines the frequency domain resources of the physical downlink control channel corresponding to the different PRACH frequency domain resources of the PRACH corresponding to the coverage enhancement level in the same subframe, and independently notifies the terminal of the frequency domain resources of the physical downlink control channel corresponding to the different PRACH frequency domain resources of the PRACH corresponding to the coverage enhancement level in the same subframe;

The network side informs the corresponding relation between a plurality of frequency domain resources of the PRACH under each coverage enhancement level and the frequency domain resources of the physical downlink control channel; or for each coverage enhancement level, respectively notifying the frequency domain resources of the physical downlink control channel corresponding to each frequency domain resource of the PRACH under the coverage enhancement level by using the N bits of information.

4. A method according to any of claims 1-3, wherein the level of coverage enhancement is embodied as a number of dB of coverage enhancement and/or a number of repeated transmissions; wherein the coverage enhancement levels include regular coverage with a coverage enhancement of 0dB and/or without repeated transmissions, and a plurality of different coverage enhancement levels with a coverage enhancement greater than 0dB and/or a number of repeated transmissions greater than 1; alternatively, the coverage enhancement levels may only include a plurality of different coverage enhancement levels having a coverage enhancement greater than 0dB and/or a number of repeated transmissions greater than 1.

5. The method according to any one of claims 1 to 3, wherein the network side sends the physical downlink control channel on the frequency domain resource of the physical downlink control channel, specifically including:

6. The method according to any of claims 1-3, wherein the physical downlink control channel is transmitted in a common search space, and the physical downlink control channel is scrambled using a random access radio network temporary identity (RA-RNTI) or a temporary cell radio network temporary identity (TC-RNTI) or a cell radio network temporary identity (C-RNTI).

7. The method according to any of claims 1-3, wherein the frequency domain resources of the physical downlink control channel comprise:

8. A method for transmitting a random access response, the method comprising:

The terminal determines the frequency domain resources of the physical downlink control channel at least according to the coverage enhancement level corresponding to the physical downlink control channel, wherein the frequency domain resources of the physical downlink control channel with different coverage enhancement levels are independently notified to the terminal by a network side; the physical downlink control channel is used for scheduling a Physical Downlink Shared Channel (PDSCH) carrying a Random Access Response (RAR);

The terminal receives the physical downlink control channel on the frequency domain resource of the physical downlink control channel;

Before the terminal determines the frequency domain resource of the physical downlink control channel at least according to the coverage enhancement level corresponding to the physical downlink control channel, the method further includes:

Acquiring configuration information of frequency domain resources of physical downlink control channels with different coverage enhancement levels, which is independently notified by a network side, through system information, and acquiring the frequency domain resources of the physical downlink control channels with different coverage enhancement levels according to the configuration information;

The independently notifying, by the network side, configuration information of the frequency domain resource of the physical downlink control channel specifically includes:

9. The method of claim 8, wherein if the PRACH corresponding to the coverage enhancement level has multiple available frequency domain resources in a same subframe, the terminal further determines the frequency domain resources of the physical downlink control channel according to the frequency domain resources used for PRACH transmission by the terminal, wherein the frequency domain resources of the physical downlink control channel corresponding to different PRACH frequency domain resources in a same subframe corresponding to the PRACH corresponding to the coverage enhancement level are independently notified to the terminal by the network side.

10. The method of claim 9, wherein before the terminal further determines the frequency domain resource of the physical downlink control channel according to the frequency domain resource used for PRACH transmission by the terminal, the method further comprises:

Acquiring configuration information of frequency domain resources of physical downlink control channels corresponding to different PRACH frequency domain resources of the same subframe, which is independently notified by a network side, of each coverage enhancement level, and acquiring frequency domain resources of physical downlink control channels corresponding to different PRACH frequency domain resources of the same subframe, of the PRACH corresponding to each coverage enhancement level according to the configuration information;

The independently notifying, by the network side, the configuration information of the frequency domain resource of the physical downlink control channel specifically includes:

11. The method according to any of claims 8 to 10, wherein the coverage enhancement level is embodied as a number of dB of coverage enhancement and/or a number of repeated transmissions; wherein the coverage enhancement levels include regular coverage with a coverage enhancement of 0dB and/or without repeated transmissions, and a plurality of different coverage enhancement levels with a coverage enhancement greater than 0dB and/or a number of repeated transmissions greater than 1; alternatively, the coverage enhancement levels may only include a plurality of different coverage enhancement levels having a coverage enhancement greater than 0dB and/or a number of repeated transmissions greater than 1.

12. The method according to any one of claims 8 to 10, wherein the receiving, by the terminal, the physical downlink control channel on the frequency domain resource of the physical downlink control channel specifically includes:

13. The method according to any of claims 8 to 10, wherein the physical downlink control channel is transmitted in a common search space and scrambled using a random access radio network temporary identity RA-RNTI or a temporary cell radio network temporary identity TC-RNTI or a cell radio network temporary identity C-RNTI.

14. The method according to any of claims 8 to 10, wherein the frequency domain resources of the physical downlink control channel include:

15. An apparatus for transmitting a random access response, comprising:

A frequency domain resource determining unit, configured to determine, according to at least a coverage enhancement level corresponding to a physical downlink control channel, a frequency domain resource of the physical downlink control channel, where the frequency domain resource of the physical downlink control channel with different coverage enhancement levels is independently notified to a terminal by a network side; the physical downlink control channel is used for scheduling a Physical Downlink Shared Channel (PDSCH) carrying a Random Access Response (RAR);

A sending unit, configured to send the physical downlink control channel on a frequency domain resource of the physical downlink control channel;

Wherein, before determining the frequency domain resource of the physical downlink control channel at least according to the coverage enhancement level corresponding to the physical downlink control channel, the frequency domain resource determining unit is further configured to:

Respectively determining the frequency domain resources of the physical downlink control channels with different coverage enhancement levels, and independently notifying the frequency domain resources of the physical downlink control channels with different coverage enhancement levels to the terminal through system information;

16. The apparatus of claim 15, wherein if a physical random access channel PRACH with the coverage enhancement level has multiple available frequency domain resources in a same subframe, the frequency domain resource determining unit further determines the frequency domain resource of the physical downlink control channel according to the frequency domain resource used for PRACH transmission, where the frequency domain resources of the physical downlink control channel corresponding to different PRACH frequency domain resources in the same subframe are independently notified to a terminal by the network side.

17. The apparatus of claim 16, wherein before the frequency-domain resource determining unit determines the frequency-domain resource of the physical downlink control channel, the frequency-domain resource determining unit is further configured to:

For each coverage enhancement level, determining the frequency domain resources of the physical downlink control channel corresponding to the different PRACH frequency domain resources of the PRACH corresponding to the coverage enhancement level in the same subframe, and independently notifying the terminal of the frequency domain resources of the physical downlink control channel corresponding to the different PRACH frequency domain resources of the PRACH corresponding to the coverage enhancement level in the same subframe;

18. The apparatus of any of claims 15 to 17, wherein the level of coverage enhancement is embodied as a number of dB of coverage enhancement and/or a number of repeated transmissions; wherein the coverage enhancement levels include regular coverage with a coverage enhancement of 0dB and/or without repeated transmissions, and a plurality of different coverage enhancement levels with a coverage enhancement greater than 0dB and/or a number of repeated transmissions greater than 1; alternatively, the coverage enhancement levels may only include a plurality of different coverage enhancement levels having a coverage enhancement greater than 0dB and/or a number of repeated transmissions greater than 1.

19. The apparatus according to any of claims 15 to 17, wherein the sending unit sends the physical downlink control channel according to an enhanced physical downlink control channel EPDCCH method on a frequency domain resource of the physical downlink control channel.

20. The apparatus according to any of claims 15 to 17, wherein the sending unit transmits the physical downlink control channel in a common search space, and scrambles the physical downlink control channel using a random access radio network temporary identity RA-RNTI or a temporary cell radio network temporary identity TC-RNTI or a cell radio network temporary identity C-RNTI.

21. The apparatus according to any of claims 15 to 17, wherein the frequency domain resources of the physical downlink control channel include:

22. An apparatus for transmitting a random access response, comprising:

A receiving unit, configured to receive the physical downlink control channel on a frequency domain resource of the physical downlink control channel;

Before the frequency domain resource determining unit determines the frequency domain resource of the physical downlink control channel at least according to the coverage enhancement level corresponding to the physical downlink control channel, the frequency domain resource determining unit is further configured to:

23. The apparatus of claim 22, wherein if the PRACH corresponding to the coverage enhancement level has multiple available frequency domain resources in a same subframe, the frequency domain resource determining unit further determines the frequency domain resource of the physical downlink control channel according to a frequency domain resource used for PRACH transmission of a terminal, wherein the frequency domain resources of the physical downlink control channel corresponding to different PRACH frequency domain resources in a same subframe corresponding to the PRACH corresponding to the coverage enhancement level are independently notified to the terminal by the network side.

24. The apparatus of claim 23, wherein before the frequency domain resource determining unit further determines the frequency domain resource of the physical downlink control channel according to the frequency domain resource used for PRACH transmission by the terminal, the frequency domain resource determining unit is further configured to:

25. The apparatus of any of claims 22-24, wherein the level of coverage enhancement is embodied as a number of dB of coverage enhancement and/or a number of repeated transmissions; wherein the coverage enhancement levels include regular coverage with a coverage enhancement of 0dB and/or without repeated transmissions, and a plurality of different coverage enhancement levels with a coverage enhancement greater than 0dB and/or a number of repeated transmissions greater than 1; alternatively, the coverage enhancement levels may only include a plurality of different coverage enhancement levels having a coverage enhancement greater than 0dB and/or a number of repeated transmissions greater than 1.

26. The apparatus according to any of claims 22 to 24, wherein the receiving unit receives the physical downlink control channel according to an Enhanced Physical Downlink Control Channel (EPDCCH) manner on a frequency domain resource of the physical downlink control channel.

27. The apparatus according to any of claims 22-24, wherein the physical downlink control channel is transmitted in a common search space and scrambled using a random access radio network temporary identity RA-RNTI or a temporary cell radio network temporary identity TC-RNTI or a cell radio network temporary identity C-RNTI.

28. The apparatus according to any of claims 22 to 24, wherein the frequency domain resources of the physical downlink control channel include: